<template>
  <div class="sidebar">
    <el-menu
      class="sidebar-el-menu"
      :default-active="onRoutes"
      :collapse="collapse"
      background-color="#324157"
      text-color="#bfcbd9"
      active-text-color="#20a0ff"
      unique-opened
      router
    >
      <template v-for="item in items">
        <template v-if="item.subs">
          <el-submenu :index="item.index" :key="item.index">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.title }}</span>
            </template>
            <template v-for="subItem in item.subs">
              <el-submenu
                v-if="subItem.subs"
                :index="subItem.index"
                :key="subItem.index"
              >
                <template slot="title">{{ subItem.title }}</template>
                <el-menu-item
                  v-for="(threeItem, i) in subItem.subs"
                  :key="i"
                  :index="threeItem.index"
                  >{{ threeItem.title }}</el-menu-item
                >
              </el-submenu>
              <el-menu-item
                v-else
                :index="subItem.index"
                :key="subItem.index"
                >{{ subItem.title }}</el-menu-item
              >
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.index" :key="item.index">
            <i :class="item.icon"></i>
            <span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
import bus from "./bus"
export default {
  data () {
    return {
      collapse: false,
      items: [
        {
          icon: "fa fa-home",
          index: "dashboard",
          title: "乱七八糟 の 首页"
        },
        {
          icon: "fa fa-server",
          index: "server",
          title: "服务器 の 破事"
        },
        {
          icon: "fa fa-terminal",
          index: "termux",
          title: "安卓 の Termux"
        },
        {
          icon: "fa fa-bitcoin",
          index: "mine",
          title: "矿老板 の 自觉"
        },
        {
          icon: "fa fa-github",
          index: "#github",
          title: "Github の Repository",
          subs: [
            {
              icon: "fa fa-github",
              index: "pb-css",
              title: "pb-css"
            }
          ]
        },
        {
          icon: "fa fa-hourglass-2",
          index: "doc",
          title: "总之就是有用 の 东西"
        },
        {
          icon: "fa fa-bomb",
          index: "#lab",
          title: "实验 の 室",
          subs: [
            {
              index: "ruffle",
              title: "ruffle"
            },
            {
              index: "editor",
              title: "editor"
            },
            {
              index: "three-js",
              title: "three-js"
            },
            {
              index: "vuex",
              title: "vuex"
            },
            {
              index: "schart",
              title: "schart"
            },
            {
              index: "mutiple-dialog",
              title: "mutiple-dialog"
            }
          ]
        },
        {
          icon: "fa fa-cog",
          index: "#admin",
          title: "鹳狸猿 の 后台",
          subs: [
            {
              index: "admin",
              title: "index"
            }
          ]
        }
      ]
    }
  },
  computed: {
    onRoutes () {
      return this.$route.name
    }
  },
  created () {
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    bus.$on("collapse", (msg) => {
      this.collapse = msg
      bus.$emit("collapse-content", msg)
    })
  }
}
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
  width: 250px;
}
.sidebar > ul {
  height: 100%;
}
.el-submenu__title > i,
.el-menu-item > i {
  display: inline-block;
  margin-right: 5px;
  width: 24px;
  text-align: center;
  font-size: 18px;
  vertical-align: middle;
}
</style>
